crypto/asn1/a_sign.c

   1 /* crypto/asn1/a_sign.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <time.h>
  61
  62 #include "cryptlib.h"
  63
  64 #ifndef NO_SYS_TYPES_H
  65 # include <sys/types.h>
  66 #endif
  67
  68 #include <openssl/bn.h>
  69 #include <openssl/evp.h>
  70 #include <openssl/x509.h>
  71 #include <openssl/objects.h>
  72 #include <openssl/buffer.h>
  73
  74 int ASN1_sign(int (*i2d)(), X509_ALGOR *algor1, X509_ALGOR *algor2,
  75              ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
  76              const EVP_MD *type)
  77         {
  78         EVP_MD_CTX ctx;
  79         unsigned char *p,*buf_in=NULL,*buf_out=NULL;
  80         int i,inl=0,outl=0,outll=0;
  81         X509_ALGOR *a;
  82
  83         for (i=0; i<2; i++)
  84                 {
  85                 if (i == 0)
  86                         a=algor1;
  87                 else
  88                         a=algor2;
  89                 if (a == NULL) continue;
  90                 if (    (a->parameter == NULL) ||
  91                         (a->parameter->type != V_ASN1_NULL))
  92                         {
  93                         ASN1_TYPE_free(a->parameter);
  94                         if ((a->parameter=ASN1_TYPE_new()) == NULL) goto err;
  95                         a->parameter->type=V_ASN1_NULL;
  96                         }
  97                 ASN1_OBJECT_free(a->algorithm);
  98                 a->algorithm=OBJ_nid2obj(type->pkey_type);
  99                 if (a->algorithm == NULL)
 100                         {
 101                         ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_UNKNOWN_OBJECT_TYPE);
 102                         goto err;
 103                         }
 104                 if (a->algorithm->length == 0)
 105                         {
 106                         ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
 107                         goto err;
 108                         }
 109                 }
 110         inl=i2d(data,NULL);
 111         buf_in=(unsigned char *)OPENSSL_malloc((unsigned int)inl);
 112         outll=outl=EVP_PKEY_size(pkey);
 113         buf_out=(unsigned char *)OPENSSL_malloc((unsigned int)outl);
 114         if ((buf_in == NULL) || (buf_out == NULL))
 115                 {
 116                 outl=0;
 117                 ASN1err(ASN1_F_ASN1_SIGN,ERR_R_MALLOC_FAILURE);
 118                 goto err;
 119                 }
 120         p=buf_in;
 121
 122         i2d(data,&p);
 123         EVP_SignInit(&ctx,type);
 124         EVP_SignUpdate(&ctx,(unsigned char *)buf_in,inl);
 125         if (!EVP_SignFinal(&ctx,(unsigned char *)buf_out,
 126                         (unsigned int *)&outl,pkey))
 127                 {
 128                 outl=0;
 129                 ASN1err(ASN1_F_ASN1_SIGN,ERR_R_EVP_LIB);
 130                 goto err;
 131                 }
 132         if (signature->data != NULL) OPENSSL_free(signature->data);
 133         signature->data=buf_out;
 134         buf_out=NULL;
 135         signature->length=outl;
 136         /* In the interests of compatibility, I'll make sure that
 137          * the bit string has a 'not-used bits' value of 0
 138          */
 139         signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 140         signature->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 141 err:
 142         memset(&ctx,0,sizeof(ctx));
 143         if (buf_in != NULL)
 144                 { memset((char *)buf_in,0,(unsigned int)inl); OPENSSL_free(buf_in); }
 145         if (buf_out != NULL)
 146                 { memset((char *)buf_out,0,outll); OPENSSL_free(buf_out); }
 147         return(outl);
 148         }
 149
 150 int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
 151              ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey,
 152              const EVP_MD *type)
 153         {
 154         EVP_MD_CTX ctx;
 155         unsigned char *buf_in=NULL,*buf_out=NULL;
 156         int i,inl=0,outl=0,outll=0;
 157         X509_ALGOR *a;
 158
 159         for (i=0; i<2; i++)
 160                 {
 161                 if (i == 0)
 162                         a=algor1;
 163                 else
 164                         a=algor2;
 165                 if (a == NULL) continue;
 166                 if (    (a->parameter == NULL) ||
 167                         (a->parameter->type != V_ASN1_NULL))
 168                         {
 169                         ASN1_TYPE_free(a->parameter);
 170                         if ((a->parameter=ASN1_TYPE_new()) == NULL) goto err;
 171                         a->parameter->type=V_ASN1_NULL;
 172                         }
 173                 ASN1_OBJECT_free(a->algorithm);
 174                 a->algorithm=OBJ_nid2obj(type->pkey_type);
 175                 if (a->algorithm == NULL)
 176                         {
 177                         ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_UNKNOWN_OBJECT_TYPE);
 178                         goto err;
 179                         }
 180                 if (a->algorithm->length == 0)
 181                         {
 182                         ASN1err(ASN1_F_ASN1_SIGN,ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
 183                         goto err;
 184                         }
 185                 }
 186         inl=ASN1_item_i2d(asn,&buf_in, it);
 187         outll=outl=EVP_PKEY_size(pkey);
 188         buf_out=(unsigned char *)OPENSSL_malloc((unsigned int)outl);
 189         if ((buf_in == NULL) || (buf_out == NULL))
 190                 {
 191                 outl=0;
 192                 ASN1err(ASN1_F_ASN1_SIGN,ERR_R_MALLOC_FAILURE);
 193                 goto err;
 194                 }
 195
 196         EVP_SignInit(&ctx,type);
 197         EVP_SignUpdate(&ctx,(unsigned char *)buf_in,inl);
 198         if (!EVP_SignFinal(&ctx,(unsigned char *)buf_out,
 199                         (unsigned int *)&outl,pkey))
 200                 {
 201                 outl=0;
 202                 ASN1err(ASN1_F_ASN1_SIGN,ERR_R_EVP_LIB);
 203                 goto err;
 204                 }
 205         if (signature->data != NULL) OPENSSL_free(signature->data);
 206         signature->data=buf_out;
 207         buf_out=NULL;
 208         signature->length=outl;
 209         /* In the interests of compatibility, I'll make sure that
 210          * the bit string has a 'not-used bits' value of 0
 211          */
 212         signature->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
 213         signature->flags|=ASN1_STRING_FLAG_BITS_LEFT;
 214 err:
 215         memset(&ctx,0,sizeof(ctx));
 216         if (buf_in != NULL)
 217                 { memset((char *)buf_in,0,(unsigned int)inl); OPENSSL_free(buf_in); }
 218         if (buf_out != NULL)
 219                 { memset((char *)buf_out,0,outll); OPENSSL_free(buf_out); }
 220         return(outl);
 221         }